The change is fine, if I understand it correctly, but GotP isn't too prevalent or too uncommon in the meta (arena at least). No change is needed.
You can't base the needing of a change on the fact that a card is used too much or it isn't, a card must be balanced and with a logic mechanic even if it is the most/less used card of the game.
On time:
As i wrote before, i think time have this big step between Scarab and GotP in terms of costs and statistics, i would like to see a card in between the two as i suggested in card ideas section with "Ra".
On the card:
GotP is fine as is, balanced, useful, strong enought to justify its cost and with a unique ability wich everyone approve methink.